FoodSnap AI

Backend/.gitignore

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+node_modules
+.env
+dist

Backend/package.json

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+{
+    "name": "foodsnapai",
+    "version": "1.0.0",
+    "main": "index.js",
+    "scripts": {
+        "test": "echo \"Error: no test specified\" && exit 1",
+        "dev": "ts-node-dev --respawn --transpile-only src/index.ts",
+        "build": "tsc",
+        "start": "node dist/index.js"
+    },
+    "keywords": [],
+    "author": "",
+    "license": "ISC",
+    "description": "",
+    "dependencies": {
+        "@google/generative-ai": "^0.24.1",
+        "@types/cors": "^2.8.19",
+        "@types/express": "^5.0.6",
+        "@types/multer": "^2.0.0",
+        "@types/node": "^24.10.1",
+        "axios": "^1.13.2",
+        "cors": "^2.8.5",
+        "dotenv": "^17.2.3",
+        "express": "^5.2.1",
+        "mongoose": "^9.1.1",
+        "multer": "^2.0.2",
+        "ts-node-dev": "^2.0.0",
+        "typescript": "^5.9.3"
+    }
+}

Backend/src/config/db.ts

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+import mongoose from "mongoose";
+import dotenv from 'dotenv';
+
+dotenv.config();
+
+export const connectDB = async(): Promise<void> => {
+    try{
+        await mongoose.connect(process.env.MONGO_URL || "");
+        console.log('mongoDB is connected');
+    }catch(err){
+        console.error('mongoConnection Failed');
+        process.exit(1);
+    }
+}

Backend/src/controllers/analyzeController.ts

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+import { Request, Response } from "express";
+import crypto from "crypto";
+import { analyzeWithGemini } from "../services/geminiService";
+import { getNutritionData } from "../services/edamamService";
+import Food from "../models/Food";
+
+export const analyzeImage = async (
+    req: Request,
+    res: Response
+): Promise<void> => {
+    try {
+        if (!req.file) {
+            res.status(400).json({ message: "No image uploaded" });
+            return;
+        }
+
+        const imageBuffer = req.file.buffer;
+        const mimeType = req.file.mimetype;
+
+        const imageHash = crypto
+            .createHash("sha256")
+            .update(imageBuffer)
+            .digest("hex");
+
+        const cachedFood = await Food.findOne({ imageHash });
+        if (cachedFood) {
+            res.json(cachedFood);
+            return;
+        }
+
+        const geminiResult = await analyzeWithGemini(imageBuffer, mimeType);
+
+        const nutritionData = await getNutritionData(
+            geminiResult.quantity,
+            geminiResult.foodName
+        );
+
+        const newFood = new Food({
+            imageHash,
+            foodName: geminiResult.foodName,
+            quantity: geminiResult.quantity,
+            nutrition: nutritionData,
+        });
+
+        await newFood.save();
+
+        res.json(newFood);
+    } catch (error) {
+        console.error("Analysis Error:", error);
+        res.status(500).json({
+            message: "Failed to analyze image",
+            error: (error as Error).message,
+        });
+    }
+};

Backend/src/index.ts

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+import express from "express";
+import cors from "cors";
+import dotenv from "dotenv";
+import { connectDB } from "./config/db";
+import analyzeRoute from "./routes/analyzeRoute";
+
+dotenv.config();
+connectDB();
+
+const app = express();
+const port = process.env.PORT || 8080;
+
+app.use(cors({
+    origin: process.env.VITE_URL,
+    credentials: true
+}));
+
+app.use(express.json());
+app.get("/", (_, res) => {
+    res.send("Hello from FoodSnap AI Backend!");
+});
+
+app.use("/api/v1", analyzeRoute);
+
+app.listen(port, () => {
+    console.log(`Server is running on port ${port}`);
+});

Backend/src/middlewares/uploadMiddleware.ts

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+import multer from 'multer';
+
+const storage = multer.memoryStorage();
+
+export const upload = multer({
+    storage: storage,
+    limits: {
+        fileSize: 5 * 1024 * 1024, 
+    },
+    fileFilter: (_, file, cb) => {
+        if (file.mimetype.startsWith('image/')) {
+            cb(null, true);
+        } else {
+            cb(new Error('Only images are allowed'));
+        }
+    },
+});

Backend/src/models/Food.ts

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+import mongoose, { Document, Schema } from "mongoose";
+
+export interface IFood extends Document {
+    imageHash: string;
+    foodName: string;
+    quantity: string;
+    nutrition: {
+        Calories: { quantity: number; unit: string };
+        Protein: { quantity: number; unit: string };
+        Fat: { quantity: number; unit: string };
+        Carbohydrates: { quantity: number; unit: string };
+    };
+    createdAt: Date;
+    updatedAt: Date;
+}
+
+const FoodSchema = new Schema(
+    {
+        imageHash: {
+            type: String,
+            required: true,
+            unique: true,
+            trim: true,
+        },
+        foodName: {
+            type: String,
+            required: true,
+            trim: true,
+        },
+        quantity: {
+            type: String,
+            required: true,
+        },
+        nutrition: {
+            type: Object,
+            required: true,
+        },
+    },
+    {
+        timestamps: true,
+    }
+);
+
+export default mongoose.model<IFood>("Food", FoodSchema);

Backend/src/routes/analyzeRoute.ts

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+import express from 'express';
+import { analyzeImage } from '../controllers/analyzeController';
+import { upload } from '../middlewares/uploadMiddleware';
+
+const router = express.Router();
+
+router.post('/analyze', upload.single('image'), analyzeImage);
+
+export default router;

Backend/src/services/edamamService.ts

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+import axios from 'axios';
+import dotenv from 'dotenv';
+
+dotenv.config();
+
+const EDAMAM_APP_ID = process.env.EDAMAM_APP_ID;
+const EDAMAM_APP_KEY = process.env.EDAMAM_APP_KEY;
+
+export interface NutritionData {
+    Calories: { quantity: number; unit: string };
+    Protein: { quantity: number; unit: string };
+    Fat: { quantity: number; unit: string };
+    Carbohydrates: { quantity: number; unit: string };
+}
+
+export const getNutritionData = async (quantity: string, foodName: string): Promise<NutritionData> => {
+    try {
+        const query = `${quantity} ${foodName}`;
+
+        const response = await axios.get("https://api.edamam.com/api/nutrition-data", {
+            params: {
+                app_id: EDAMAM_APP_ID,
+                app_key: EDAMAM_APP_KEY,
+                ingr: query,
+            },
+        });
+
+        const data = response.data;
+
+        let finalNutrition: NutritionData = {
+            Calories: { quantity: 0, unit: 'kcal' },
+            Protein: { quantity: 0, unit: 'g' },
+            Fat: { quantity: 0, unit: 'g' },
+            Carbohydrates: { quantity: 0, unit: 'g' }
+        };
+
+        const hasTopLevelData = data.totalNutrients && Object.keys(data.totalNutrients).length > 0;
+
+        if (hasTopLevelData) {
+            if (data.totalNutrients.ENERC_KCAL) {
+                finalNutrition.Calories = { quantity: data.totalNutrients.ENERC_KCAL.quantity, unit: data.totalNutrients.ENERC_KCAL.unit };
+            }
+            if (data.totalNutrients.PROCNT) {
+                finalNutrition.Protein = { quantity: data.totalNutrients.PROCNT.quantity, unit: data.totalNutrients.PROCNT.unit };
+            }
+            if (data.totalNutrients.FAT) {
+                finalNutrition.Fat = { quantity: data.totalNutrients.FAT.quantity, unit: data.totalNutrients.FAT.unit };
+            }
+            if (data.totalNutrients.CHOCDF) {
+                finalNutrition.Carbohydrates = { quantity: data.totalNutrients.CHOCDF.quantity, unit: data.totalNutrients.CHOCDF.unit };
+            }
+
+        } else if (data.ingredients && data.ingredients.length > 0) {
+            const parsed = data.ingredients[0].parsed;
+            if (parsed && parsed.length > 0 && parsed[0].nutrients) {
+                const n = parsed[0].nutrients;
+
+                if (n.ENERC_KCAL) finalNutrition.Calories = { quantity: n.ENERC_KCAL.quantity, unit: n.ENERC_KCAL.unit };
+                if (n.PROCNT) finalNutrition.Protein = { quantity: n.PROCNT.quantity, unit: n.PROCNT.unit };
+                if (n.FAT) finalNutrition.Fat = { quantity: n.FAT.quantity, unit: n.FAT.unit };
+                if (n.CHOCDF) finalNutrition.Carbohydrates = { quantity: n.CHOCDF.quantity, unit: n.CHOCDF.unit };
+            }
+        }
+
+        return finalNutrition;
+    } catch (error) {
+        throw new Error('Failed to fetch nutrition data from Edamam');
+    }
+};

Backend/src/services/geminiService.ts

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+import { GoogleGenerativeAI } from "@google/generative-ai";
+import dotenv from "dotenv";
+
+dotenv.config();
+
+const genAI = new GoogleGenerativeAI(process.env.GEMINI_API_KEY || "");
+const model = genAI.getGenerativeModel({ model: "gemini-2.5-flash" });
+
+interface GeminiResponse {
+    foodName: string;
+    quantity: string;
+}
+
+export const analyzeWithGemini = async (
+    imageBuffer: Buffer,
+    mimeType: string
+): Promise<GeminiResponse> => {
+    try {
+        const prompt = `
+      Analyze this food image. 
+      Identify the food item and estimate the portion size/quantity.
+      Return ONLY a valid JSON object in the following format, with no markdown code blocks:
+      {
+        "foodName": "name of food",
+        "quantity": "estimated quantity (e.g., 100gm, 1kg)"
+      }
+    `;
+
+        const imagePart = {
+            inlineData: {
+                data: imageBuffer.toString("base64"),
+                mimeType: mimeType,
+            },
+        };
+
+        const result = await model.generateContent([prompt, imagePart]);
+        const response = await result.response;
+        const text = response.text();
+        const jsonResponse: GeminiResponse = JSON.parse(text);
+        return jsonResponse;
+    } catch (error) {
+        throw new Error("Failed to analyze image with Gemini");
+    }
+};

Backend/tsconfig.json

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+{
+    "compilerOptions": {
+        /* Basic Options */
+        "target": "es2022" /* Specify ECMAScript target version: 'ES3' (default), 'ES5', 'ES2015', 'ES2016', 'ES2017','ES2018' or 'ESNEXT'. */,
+        "module": "commonjs" /* Specify module code generation: 'none', 'commonjs', 'amd', 'system', 'umd', 'es2015', or 'ESNext'. */,
+        "lib": [
+            "esnext",
+            "dom"
+        ] /* Specify library files to be included in the compilation. */,
+        // "allowJs": true,                       /* Allow javascript files to be compiled. */
+        // "checkJs": true,                       /* Report errors in .js files. */
+        "jsx": "react-jsx" /* Specify JSX code generation: 'preserve', 'react-native', or 'react'. */,
+        // "declaration": true,                   /* Generates corresponding '.d.ts' file. */
+        // "declarationMap": true,                /* Generates a sourcemap for each corresponding '.d.ts' file. */
+        // "sourceMap": true,                     /* Generates corresponding '.map' file. */
+        // "outFile": "./",                       /* Concatenate and emit output to single file. */
+        "outDir": "./dist/" /* Redirect output structure to the directory. */,
+        "rootDir": "./src" /* Specify the root directory of input files. Use to control the output directory structure with --outDir. */,
+        // "composite": true,                     /* Enable project compilation */
+        // "removeComments": true,                /* Do not emit comments to output. */
+        "noEmit": false /* Do not emit outputs. */,
+        // "importHelpers": true                  /* Import emit helpers from 'tslib'. */,
+        // "downlevelIteration": true,            /* Provide full support for iterables in 'for-of', spread, and destructuring when targeting 'ES5' or 'ES3'. */
+        // "isolatedModules": true,               /* Transpile each file as a separate module (similar to 'ts.transpileModule'). */
+        /* Strict Type-Checking Options */
+        "strict": true /* Enable all strict type-checking options. */,
+        // "noImplicitAny": true,                 /* Raise error on expressions and declarations with an implied 'any' type. */
+        // "strictNullChecks": true,              /* Enable strict null checks. */
+        // "strictFunctionTypes": true,           /* Enable strict checking of function types. */
+        // "strictBindCallApply": true,           /* Enable strict 'bind', 'call', and 'apply' methods on functions. */
+        // "strictPropertyInitialization": true,  /* Enable strict checking of property initialization in classes. */
+        // "noImplicitThis": true,                /* Raise error on 'this' expressions with an implied 'any' type. */
+        // "alwaysStrict": true,                  /* Parse in strict mode and emit "use strict" for each source file. */
+        /* Additional Checks */
+        "noUnusedLocals": true /* Report errors on unused locals. */,
+        "noUnusedParameters": true /* Report errors on unused parameters. */,
+        // "noImplicitReturns": true,             /* Report error when not all code paths in function return a value. */
+        // "noFallthroughCasesInSwitch": true,    /* Report errors for fallthrough cases in switch statement. */
+        /* Module Resolution Options */
+        "moduleResolution": "node" /* Specify module resolution strategy: 'node' (Node.js) or 'classic' (TypeScript pre-1.6). */,
+        // "baseUrl": "./",                       /* Base directory to resolve non-absolute module names. */
+        // "paths": {},                           /* A series of entries which re-map imports to lookup locations relative to the 'baseUrl'. */
+        // "rootDirs": [],                        /* List of root folders whose combined content represents the structure of the project at runtime. */
+        // "typeRoots": [],                       /* List of folders to include type definitions from. */
+        // "types": [],                           /* Type declaration files to be included in compilation. */
+        // "allowSyntheticDefaultImports": true   /* Allow default imports from modules with no default export. This does not affect code emit, just typechecking. */,
+        "esModuleInterop": true /* Enables emit interoperability between CommonJS and ES Modules via creation of namespace objects for all imports. Implies 'allowSyntheticDefaultImports'. */,
+        // "preserveSymlinks": true,              /* Do not resolve the real path of symlinks. */
+        /* Source Map Options */
+        // "sourceRoot": "",                      /* Specify the location where debugger should locate TypeScript files instead of source locations. */
+        // "mapRoot": "",                         /* Specify the location where debugger should locate map files instead of generated locations. */
+        // "inlineSourceMap": true,               /* Emit a single file with source maps instead of having a separate file. */
+        // "inlineSources": true,                 /* Emit the source alongside the sourcemaps within a single file; requires '--inlineSourceMap' or '--sourceMap' to be set. */
+        /* Experimental Options */
+        // "experimentalDecorators": true,        /* Enables experimental support for ES7 decorators. */
+        // "emitDecoratorMetadata": true,         /* Enables experimental support for emitting type metadata for decorators. */
+        "skipLibCheck": true,
+        "forceConsistentCasingInFileNames": true,
+        "resolveJsonModule": true
+    },
+    "exclude": ["node_modules"]
+}